Iguana - Electric MV120 on OA

Original effect designs complete with verified schematics, layouts and instructions. All project were freely contributed by members and cannot be used for commercial purposes without consent of the respective owners of the copyright.
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Vitallka
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Post by Vitallka »

Hello!
This is my version of Electric MV120.
Scheme - https://app.box.com/s/l112gqxijchez5jhxqxxm9nq4fh4svqb
samples are recorded by the microphone to the microphone input of the laptop (Iguana - tube amp - cab 1x12 Celestion Seventy80 - microphone - mic_in - Audacity)



squirrels
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Post by squirrels »

Sounds great, thanks for sharing your design .. I just tried building one using a layout from dirtboxlayouts with no luck. After trying to debug it, we were possibly wondering if there was a mistake in the schematic? Very low clean signal passes and none of the pots function at all. The voltages using a J201 and TL072 I had were as follows:

J201
G: 4.19v
S: 5.71v
D: 9.07v

TL072:
1: 4.54v
2:4.54v
3: 2.26v
4: 0
5: 4.49v
6: 1.59v
7: 8.48v
8: 9.07v

Any help would be appreciated, I think a lot of people would like this design.

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Vitallka
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Post by Vitallka »

Try a different dual operational amplifier (lm833, tl062, tl082, 4558, etc). On 1, 2, 3, 5, 6, 7 pin without signal should be 1/2 Vcc.
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iguana.zip
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squirrels
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Post by squirrels »

Thanks for the reply. I tried it with an NE5532 with the same results, could just be an error in my build then. I’ll try rebuilding it, the clips sound great.

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Vitallka
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Post by Vitallka »

There are a lot of bugs in layouts with dirtboxlayouts. Try to build on the start of a breadboard like this https://images-na.ssl-images-amazon.com ... SY400_.jpg or https://arduinomaster.ru/wp-content/upl ... -pajku.jpg

squirrels
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Post by squirrels »

I rebuilt it, voltages are normal and it’s firing up but the gain pot doesn’t seem to work. Builder error, I’m sorry that I questioned the schematic. I noticed in your demos there isn’t much change when the gain pot is turned, is that right then? I have a little more debugging to do if not.

I’m surprised to hear that about dirtboxlayouts. I’ve had had nothing but successful builds from there and Fuzzhead is very helpful.

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Vitallka
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Post by Vitallka »

If you twist the gain, the sound changes. I created my version of the layout and attached it to the message.
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iguana layout.png

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